add8u_8GM.c

/***
* This code is a part of EvoApproxLib library (ehw.fit.vutbr.cz/approxlib) distributed under The MIT License.
* When used, please cite the following article(s): V. Mrazek, L. Sekanina, Z. Vasicek "Libraries of Approximate Circuits: Automated Design and Application in CNN Accelerators" IEEE Journal on Emerging and Selected Topics in Circuits and Systems, Vol 10, No 4, 2020 
* This file contains a circuit from a sub-set of pareto optimal circuits with respect to the pwr and mre parameters
***/
// MAE% = 9.00 %
// MAE = 46 
// WCE% = 29.10 %
// WCE = 149 
// WCRE% = 6400.00 %
// EP% = 99.33 %
// MRE% = 22.62 %
// MSE = 3188 
// PDK45_PWR = 0.0015 mW
// PDK45_AREA = 8.0 um2
// PDK45_DELAY = 0.11 ns
#include <stdint.h>
#include <stdlib.h>

uint64_t add8u_8GM(uint64_t a, uint64_t b) {
  int wa[8];
  int wb[8];
  uint64_t y = 0;
  wa[0] = (a >> 0) & 0x01;
  wb[0] = (b >> 0) & 0x01;
  wa[1] = (a >> 1) & 0x01;
  wb[1] = (b >> 1) & 0x01;
  wa[2] = (a >> 2) & 0x01;
  wb[2] = (b >> 2) & 0x01;
  wa[3] = (a >> 3) & 0x01;
  wb[3] = (b >> 3) & 0x01;
  wa[4] = (a >> 4) & 0x01;
  wb[4] = (b >> 4) & 0x01;
  wa[5] = (a >> 5) & 0x01;
  wb[5] = (b >> 5) & 0x01;
  wa[6] = (a >> 6) & 0x01;
  wb[6] = (b >> 6) & 0x01;
  wa[7] = (a >> 7) & 0x01;
  wb[7] = (b >> 7) & 0x01;
  int sig_18 = wb[7] ^ wa[7];
  int sig_25 = ~((int)0);
  int sig_26 = 0;
  int sig_31 = ~((int)0);
  int sig_42 = wa[7] & wb[7];
  y |=  (sig_31 & 0x01) << 0; // default output
  y |=  (wb[6] & 0x01) << 1; // default output
  y |=  (wb[1] & 0x01) << 2; // default output
  y |=  (sig_26 & 0x01) << 3; // default output
  y |=  (wa[2] & 0x01) << 4; // default output
  y |=  (wb[6] & 0x01) << 5; // default output
  y |=  (sig_25 & 0x01) << 6; // default output
  y |=  (sig_18 & 0x01) << 7; // default output
  y |=  (sig_42 & 0x01) << 8; // default output
   return y;
}